<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>报表管理</el-breadcrumb-item>
      <el-breadcrumb-item>报表列表</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card class="box-card">
      <!-- 为ECharts准备一个具备大小（宽高）的Dom -->
      <div id="main" style="width: 850px;height:400px;"></div>
    </el-card>
  </div>
</template>
<script>
// 1:导入echerts 图表
import echarts from "echarts"
// 鼠标移动到报表上需要有鼠标跟随的效果，用到之前用的深拷贝的插件 lodash
import _ from "lodash"

export default {
  data() {
    return {
      // options需要合并的对象
      options: {
        title: {
          text: "用户来源"
        },
        tooltip: {
          trigger: "axis",
          axisPointer: {
            type: "cross",
            label: {
              backgroundColor: "#E9EEF3"
            }
          }
        },
        grid: {
          left: "3%",
          right: "4%",
          bottom: "3%",
          containLabel: true
        },
        xAxis: [
          {
            boundaryGap: false
          }
        ],
        yAxis: [
          {
            type: "value"
          }
        ]
      }
    }
  },
  async mounted() {
    // 2 :基于准备好的dom，初始化echarts实例
    var myChart = echarts.init(document.getElementById("main"))
    // 指定图表的配置项和数据

    // 发获取折线图的请求
    const { data: res } = await this.$http.get("reports/type/1")
    if (res.meta.status !== 200) return this.$message.error("获取折线图失败")

    // 合并 这样就有鼠标跟随的效果啦
    const result = _.merge(this.options, res.data)

    // 使用刚指定的配置项和数据显示图表。
    myChart.setOption(result)
  }
}
</script>
<style lang="less" scoped></style>
